<h2>题目编号 : 250</h2>
<div style="color:#666;font-size:80%;">13 June 2009</div><br />
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<p>Find the number of non-empty subsets of {1<img src="" style="display:none;" alt="^(" /><sup>1</sup><img src="" style="display:none;" alt=")" />, 2<img src="" style="display:none;" alt="^(" /><sup>2</sup><img src="" style="display:none;" alt=")" />, 3<img src="" style="display:none;" alt="^(" /><sup>3</sup><img src="" style="display:none;" alt=")" />,..., 250250<img src="" style="display:none;" alt="^(" /><sup>250250</sup><img src="" style="display:none;" alt=")" />}, the sum of whose elements is divisible by 250. Enter the rightmost 16 digits as your answer.</p>
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